Flushing-cistern.



THOMAS SMITH, OF SOUTH ranna, VICTORIA, vus'rrnttm,

ASSIGNOR OF ONE-HALF TO MARK YINDER, OF SOUTH YARRA, VICTORIA, AUSTRALIA.

FLUSHING-CISTERN.

Specification of Letters Patent.

Patented Oct. 29, 1907.

Application filed October 30. 1906. Serial No. 341.331.

To all whom it may concern:

Be it known that I, Tnonas Snrrn, a subject or the King of Great Britain. residing at 20 (lrcat Davis street, South Yarra. in the State oi Victoria, Australia. have invented certain new and usclul Improvements in Flushing-cisterns; and I do declare the following to be a full clear, and exact description of the invention. such as will enable others skilled in the art to which it appertains to make and use the same.

The invention consists essentially in making an apparatus for flushing purposes whi ch is actual ed b y opening a valve to release imprisoned air. consemiently doing away with any necessity for chains or levers to the tank or cistern.

The apparatus when constructed and arranged in the manner hen inaiter described is for the purpose ol' [lushing water closets, urinals. sinks and the like.

In order that the invention may be understood I will describe same with relerence to the accompanying drawings:

a represents the cistern which is [illcd to the required height h, in the ordinary manner by the hall tap c.

d is a pipe which conducts the water from the cistern to the fitting to be flushed. A portion ol' said pipe (I is bent to form a coil or double trap (1. (1, r1. 1/. The cnd oi (l terminates in an open mouth. The top of coil is a little (say about two inches in an ordinary water closet cistern) below the water line I). From (I a tube c is led away and terminates in cock or valve r The bore in the said tube e and the said valve 9 is sutiiciently large to allow the imprisoned air to escape in reasonable time from air lock (Z' but not large enough to allow sutlicient air in to stop siphonic actionz liut ii it should be desirable to have a larger bore the valve r could be constrnctcd to allow the egress of air and not, the ingrcss or an automatic valve It could be inserted in tube 0 [or the same purpose. This valve may be formed with a ball h to rise or fall irom or to a seat t'ormed tor the purpose. The valve g is preferably made self closing.

From pipe 4; below valve 71 a branch pipe Z is taken and carried below seal or trap (1 to admit air to lbefore the cistern is quite empty. for the purpose oi completely stopping siphonic action. and preventing the sucking noise common to flushing cisterns.

The conduit pipe c, of ball tap o, is constructed with an inlet orilice c and two outlet orifices c and a, so that, when the Water is flowing through c the said water sucks in air at 6- and conveys it to and past leg 11 of coil through the orifices c and c. Should too large a quantity of air be conveyed to leg (l while the cistern is flushing, the siphonic action would be stopped. to pr vent this the conduit 0 is carried to and past the leg d for the following reasons:-1i there should be a low pressure of water flowing through the conduit the whole or nearly the whole of the air would rass throu h the [list oritice c and into leg (7, which air would be sutlicicnt to recharge air siphonic action should the cistern bc lock and yct not su[licicnt to stop [lushing -should there be a high pressure of water [lowing through 1:

more than sutlicient pass through with the water action would be sto air to stop siphonic action would into cistern. and siphonic )ped it it were all delivered at c.

but the velocity ot' the water would carry nearly the whole oi the air past the [irst orifice c to second orilice c, where itwould discharge into cistern well clear ol' the leg ll and thus be powerless to stop siphonic action. Should the velocity ol the water not allow sutlicient air to escape through [irst orifice c. the del'cct is remedied by reducing the oritice c. The conduit 0 with oriticcs varying pressure sa pounds to the square open while the cister 3W0", can be simply and easily set to act at any y from [ivc pounds to seventy inch. Should the valve G be held '11 is [illing the water will displace the air in the air-lock and flow out of the cistern as Inst as it [lows in. and n siphonic action. but

ot necessarily start and maintain on the valve G being closed the water [lowing through the conduit pipe carries with it;- su [licient air and delivers same in such a position tha t. it will displace the water in the air-lock and so render the cistern in the condition to be flushed.

The action of my apparatus is as t'ollowslhe water [lowing in through the ball tap c and [illing the cistern to the rcquircd hcight I), the valve {1 being closed the trap 11 becoming water sealed, and d and L being submcrgcd the air in (1' water [lowing through (1 height than the top forms a lock which prevents the The cistern [ills to a grtater oi the coil, the said height being controlled by the depth of seal in the [rap (1. On the valve 5 being sutliciently opened the air is allowed to escape rapidly from (Z the water immediately falls through the coil and pipe (1 starting and maintaining siphonic action until the cistern is emptied to the required depth through (1 Air is admitted through the pipe I to completely vent sucking noise.

Having thus dcscr and desire to secure l stop siphonic action and to preibed my invention, what I claim iy Letters Patent is-- A cistern comprising a trapped pipe having its end opening near the bottom of the cistern. tube c connected to the top of the trapped pipe, a valve on the [rec said tube. a conduit 1 beyond the end of the trapped inlet port and an outlet port trapped pipe.

in testimony whet-cot i have specification in the pr Witnesses A. ilanKi-in, Hionn Sni'rn.

end or )ipe. delivering the water at a pointy pipe and having an air leading to the end ot' the signed my name to this escnce ot' two subscribing witnesses.

THUHAS SMITH. 

